<!--
	CSS世界97页
-->
<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style>
			*{
				margin: 0;
				padding: 0;
			}
.clearfix:after {content:"\200B"; display:block; height:0; clear:both; }
.clearfix { *zoom:1;}
.father{
	width: 300px;
	height: 300px;
	background-color: #f00;
	position: relative;
}
.son{
	width: 200px;
	height: 100px;
	position: absolute;
	left: 0;
	right: 0;
	top: 0;
	bottom: 0;
	margin: auto;
	background-color: #00f;
}
		</style>
	</head>
	<body>
	<div class="father">
    <div class="son"></div>
</div>
	</body>	
</html>
